TL;DR: If you are replacing Ionworks, the closest options are Boost Biomes, ThereCraft, Passenger AI. The table below compares 12 alternatives on what they do, stage, size and status.
Every alternative below is compared on what it actually does, not just its category — so you can see which one genuinely replaces Ionworks (YC Summer 2024).
Last verified:
The three closest alternatives to Ionworks are:
| Alternative | What it does | Stage | Team | Status |
|---|---|---|---|---|
| Boost Biomes | — | YC Summer 2019 | 12 | Inactive |
| ThereCraft | — | YC Summer 2017 | 1 | Active |
| Passenger AI | Software for robotaxi operations. | YC Summer 2018 | 5 | Inactive |
| Apollo Atomics, Inc. | We make the most compact nuclear reactors | YC Spring 2026 | — | Active |
| Rewbi | A stealth mode startup. | YC Summer 2024 | 3 | Active |
| StableBrowse | Building the Data Infrastructure layer for Physical AI. | YC Spring 2026 | 3 | Active |
| Iron Grid | Foundational models for risk and quality. | YC Summer 2025 | 2 | Active |
| Navier AI | Agent-Driven Engineering | YC Winter 2024 | 7 | Active |
| PowerX | AI powered sensors that save energy, water and emissions | YC Winter 2020 | 20 | Acquired |
| deepsilicon | Software and hardware to run neural networks faster and cheaper | YC Summer 2024 | 2 | Inactive |
| Inversion Space | Turning space into a transportation layer for Earth | YC Summer 2021 | 28 | Active |
| Posh | Rapidly deployable energy solutions for modern commercial and… | YC Winter 2022 | 10 | Active |
It depends on your size. Boost Biomes is the closest match on what Ionworks actually does. If you need something more established, sort the table by team size — larger teams generally mean more support and a longer track record. If budget is the constraint, the earlier-batch companies are usually the ones still competing on price.
Ionworks is still operating, so switching is a choice rather than a forced migration. Compare on fit and price rather than urgency.
Every company here is Y Combinator-backed and was matched to Ionworks on what it actually does — its own description of its product — rather than on a broad category label. Batch, team size and operating status come from the YC directory and are shown as-is. We do not rank by payment.
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